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If the pair of lines \(x^2 - 2pxy - y^2 = 0\) and \(x^2 - 2qxy - y^2 = 0\) are such that each pair bisects the angle between the other pair, then pq equals.
(a) \(-1 \)
(b) 0
(c) 1
(d) 2
Updated Wed, 10 Oct 2018 11:31 am


The meanand S.D of 20 items were found to be 10 and 2. If an item 12 was misread as 8 the correct mean and S.D are
Updated Tue, 11 Sep 2018 02:28 pm